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GMC Rally Wagon 1500 Problems

Highter Than Nornal Idle Due to Vacuum Leak on GMC Rally Wagon 1500

Problem Description and Possible Solution

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

(4 people reported this problem)

GMC Rally Wagon 1500 Vehicles With This Problem

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Average mileage: (–)
4 model years affected: 1990, 1991, 1992, 1993
Not Your GMC Rally Wagon 1500 Problem?
Brake problem? Or maybe a faulty head gasket cylinder?
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